A few suspects are under custody over the alleged poisoning. One of the accused is said to have confessed that 250 men have undergone training to poison wells across the country, but the claim is yet to be verified.
Via  IBT

The man allegedly caught poisoning a Schieffelin well (name unknown)

This dog, on which the poison was reportedly tested, is said to have melted instantly upon drinking the water from the well

Paraphernalia seized from the alleged poisoner